only use default_path when run with rspec

Author: dchelimsky

features/command_line/ruby.feature

@@ -1,6 +1,12 @@
 Feature: run with ruby command
 
-  @wip
+  You can use the `ruby` command to run specs. You just need to require
+  `rspec/autorun`. 
+  
+  Generally speaking, you're better off using the `rspec` command, which
+  requires `rspec/autorun` for you, but some tools only work with the `ruby`
+  command.
+
   Scenario:
     Given a file named "example_spec.rb" with:
       """

lib/rspec/core/configuration.rb

@@ -311,10 +311,14 @@ def reporter
 
       def files_or_directories_to_run=(*files)
         files = files.flatten
-        files << default_path if files.empty? && default_path
+        files << default_path if command == 'rspec' && default_path && files.empty?
         self.files_to_run = get_files_to_run(files)
       end
 
+      def command
+        $0.split(File::SEPARATOR).last
+      end
+
       def get_files_to_run(files)
         patterns = pattern.split(",")
         files.map do |file|

spec/rspec/core/configuration_spec.rb

@@ -176,10 +176,17 @@ module RSpec::Core
       end
 
       context "with default default_path" do
-        it "loads files named _spec.rb" do
+        it "loads files in the default path when run by rspec" do
+          config.stub(:command) { 'rspec' }
           config.files_or_directories_to_run = []
           config.files_to_run.should_not be_empty
         end
+
+        it "does not load files in the default path when run by ruby" do
+          config.stub(:command) { 'ruby' }
+          config.files_or_directories_to_run = []
+          config.files_to_run.should be_empty
+        end
       end
     end